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A Periodontal abscess (also termed lateral abscess,〔 or parietal abscess), is a localized collection of pus (i.e. an abscess) within the tissues of the periodontium. It is a type of dental abscess. A periodontal abscess occurs alongside a tooth, and is different from the more common periapical abscess, which represents the spread of infection from a dead tooth (i.e. which has undergone pulpal necrosis). To reflect this, sometimes the term "lateral (periodontal) abscess" is used. In contrast to a periapical abscess, periodontal abscesses are usually associated with a vital (living) tooth. Abscesses of the periodontium are acute bacterial infections classified primarily by location. ==Classification== There are four types of abscesses that can involve the periodontal tissues:〔 # Gingival abscess-- a localized, purulent infection involves only the soft gum tissue near the marginal gingiva or the interdental papilla.〔 # Periodontal abscess-- a localized, purulent infection involving a greater dimension of the gum tissue, extending apically and adjacent to a periodontal pocket.〔 # Pericoronal abscess-- a localized, purulent infection within the gum tissue surrounding the crown of a partially or fully erupted tooth.〔 Usually associated with an acute episode of pericoronitis around a partially erupted and impacted mandibular third molar (lower wisdom tooth). # combined periodontal/endodontic abscess 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「periodontal abscess」の詳細全文を読む スポンサード リンク
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